National Dental Examining Board of Canada (NDEB) Practice Exam 2025 - Free NDEB Practice Questions and Study Guide

Question: 1 / 400

Zinc containing amalgam restorations demonstrate:

Poorer survival rates compared to non-zinc amalgams

Higher sensitivity to moisture

Lower strength

Better overall survival rates than high copper amalgams not containing Zn

Zinc containing amalgam restorations demonstrate better overall survival rates than high copper amalgams not containing Zn because zinc improves the handling and setting characteristics of the amalgam, leading to a better fit and decreased marginal leakage. Poorer survival rates (option A) and lower strength (option C) are incorrect because zinc improves the strength and durability of the amalgam. Higher sensitivity to moisture (option B) is also incorrect because zinc helps to protect the restoration from moisture and corrosion. Therefore, option D is the most accurate and complete answer.

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